libc.info: isascii

Go forward to iscntrl
Go backward to isalpha
Go up to Ctype
Go to the top op libc

`isascii'--ASCII character predicate

*Synopsis*
     #include <ctype.h>
     int isascii(int C);
   *Description*
`isascii' is a macro which returns non-zero when C is an ASCII
character, and 0 otherwise.  It is defined for all integer values.
   You can use a compiled subroutine instead of the macro definition by
undefining the macro using ``#undef isascii''.
*Returns*
`isascii' returns non-zero if the low order byte of C is in the range 0
to 127 (`0x00'-`0x7F').
*Portability*
`isascii' is ANSI C.
   No supporting OS subroutines are required.